Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5dfe05bdb781e2941bfab2d7c5941b02f3cec4342ddcdd9628f750cc8f910885:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16